1
A student obtained a battery, and she did the following with it.
She plugged it into a battery charger, which transferred 12,000 J electrical energy to it.
• She placed it into a small electric heater, which produced 9,000 J of thermal energy.
What was the net change in the energy of the battery after the student obtained it?
OA. a decrease of 21,000 J
OB. an increase of 21,000 J
OC. a decrease of 3,000 J
OD. an increase of 3,000 J
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